terraform-aws-elasticsearch-cloudwatch-sns-alarms

Terraform module that configures important elasticsearch alerts using CloudWatch and sends them to an SNS topic.

Create a set of sane Elasticsearch CloudWatch alerts for monitoring the health of an elasticsearch cluster.

v1.0.0 supports terraform v0.12 syntax!

This project is inspired by CloudPosse

It's 100% Open Source and licensed under the APACHE2.

Usage

area	metric	comparison operator	threshold	rationale
Sharding	ClusterStatus.red	>=	1	At least one primary shard and its replicas are not allocated to a node for 1 minute 1 consecutive time. Threshold should always be 1.
Sharding	ClusterStatus.yellow	>=	1	At least one replica shard is not allocated to a node for 1 minute 1 consecutive time. Threshold should always be 1.
Storage	FreeStorageSpace	<=	20480 MB	A node in your cluster is down to 20 GiB of free storage space for 1 minute 1 consecutive time. This value is in MiB, so rather than 20480, we recommend setting it to 25% of the storage space for each node.
Storage	ClusterIndexWritesBlocked	>=	1	The cluster is blocking write requests for 5 minutes 1 consecutive time. Threshold should always be 1.
Node Count	Nodes	<	x	x is the number of nodes in your cluster. This alarm indicates that at least one node in your cluster has been unreachable for one day.
Snapshot	AutomatedSnapshotFailure	>=	1	An automated snapshot failed for 1 minute 1 consecutive time. This failure is often the result of a red cluster health status.
CPU	CPUUtilization	>=	80 %	CPU utilization average is >= 80% for 15 minutes, 3 consecutive times for the node cluster.
Memory	JVMMemoryPressure	>=	80 %	JVMMemoryPressure maximum is >= 80% for 15 minutes, 1 consecutive time.
CPU	MasterCPUUtilization	>=	80 %	Dedicated master nodes' CPU utilization is >= 80% for 15 minutes, 3 consecutive times.
Memory	MasterJVMMemoryPressure	>=	80 %	Dedicated master nodes' maximum JVM memory usage is >= 80% for 15 minutes, 1 consecutive time.

Examples

See the examples/ directory for working examples.

resource "aws_elasticsearch_domain" "es" {
  domain_name           = "example"
  elasticsearch_version = "6.3"

  cluster_config {
    instance_type = "r4.large.elasticsearch"
  }

  snapshot_options {
    automated_snapshot_start_hour = 23
  }

  tags = {
    Domain = "TestDomain"
  }
}

module "es_alarms" {
  source         = "github::https://github.com/dubiety/terraform-aws-elasticsearch-cloudwatch-sns-alarms.git?ref=master"
  domain_name    = "example"
}

Inputs

Name	Description	Type	Default	Required
domain_name	The Elasticserach domain name you want to monitor.	string	-	yes
alarm_name_postfix	Alarm name postfix	string	""	no
alarm_name_prefix	Alarm name prefix	string	""	no
cpu_utilization_threshold	The maximum percentage of CPU utilization	string	80	no
free_storage_space_threshold	The minimum amount of available storage space in Byte.	string	21474836480	no
jvm_memory_pressure_threshold	The maximum percentage of the Java heap used for all data nodes in the cluster	string	80	no
master_cpu_utilization_threshold	The maximum percentage of CPU utilization of master nodes	string	""	no
master_jvm_memory_pressure_threshold	The maximum percentage of the Java heap used for master nodes in the cluster	string	""	no
min_available_nodes	The minimum available (reachable) nodes to have	string	1	no
monitor_automated_snapshot_failure	Enable monitoring of automated snapshot failure	string	true	no
monitor_cluster_index_writes_blocked	Enable monitoring of cluster index writes being blocked	string	true	no
monitor_cluster_status_is_red	Enable monitoring of cluster status is in red	string	true	no
monitor_cluster_status_is_yellow	Enable monitoring of cluster status is in yellow	string	true	no
monitor_cpu_utilization_too_high	Enable monitoring of CPU utilization is too high	string	true	no
monitor_free_storage_space_too_low	Enable monitoring of cluster average free storage is to low	string	true	no
monitor_insufficient_available_nodes	Enable monitoring insufficient available nodes	string	false	no
monitor_jvm_memory_pressure_too_high	Enable monitoring of JVM memory pressure is too high	string	true	no
monitor_master_cpu_utilization_too_high	Enable monitoring of CPU utilization of master nodes are too high. Only enable this when dedicated master is enabled	string	false	no
monitor_master_jvm_memory_pressure_too_high	Enable monitoring of JVM memory pressure of master nodes are too high. Only enable this wwhen dedicated master is enabled	string	false	no
sns_topic	SNS topic you want to specify. If leave empty, it will use a prefix and a timestampe appended	string	""	no

Outputs

Name	Description
sns_topic_arn	The ARN of the SNS topic
sns_topic_name	The SNS topic name

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License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
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